Thanks for the info folks, I'm looking at a unit that a friend of mine has, should tow well behind my Smart car at that weight, I'm thinking that its a 4/5 Alco plate is saying 1982 [You must be registered and logged in to see this link.]

Thanks for the welcome & the info, I thought it may be a 4/5 as there is room for the trailer triangle between the rear lights & the door frame. There are pictures of outfits with the triangle above the same lights as it wouldn't fit between the light & the door frame so I'm thinking those are the 4's. I hope I'm not wrong!!

If the manufacturer's don't give any tow weights, can you legally tow in this country?

I don't see why not, I'm not going near the kerb weight of the car so I think its going to be OK. I'm having a look at the unit tomorrow & will do a test tow before I buy it, If the car feels strained then I will walk away.

Woo Hoo! Picked it up today in Poole, the tub is just under 5' wide so I think that makes it a 4/5. Towed it back behind the Smart car, hardly knew it was there! kept an eye on the engine temp all the way back to Bristol, stayed in the normal so its not putting much extra strain on the engine.Now starts the fun, I don't think I can live with the blue paint, will maybe go for cream or something like the car colour, then a full rewire as the wiring is terrible!

Caz1960 wrote: looking good can't wait to see your photo's think it would look good matching your car

I shall be looking for paint as close to the car colour today! (will not be metallic though!) not sure what I'm going to do with the blue cover though short of getting another made up in grey so as to look silver.